Question: For which disease aspirin is being used?
Paraphrase: For which illness headache medicine is being used?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P2176 wd:Q18216 . ?sbj wdt:P31 wd:Q12136 } 
Answer: acute coronary syndrome, tension headache, ischaemic heart disease, retinal vein occlusion